Interconnector Watch: Thursday 4 June 2026
At 07:30 AEST, NEM interconnectors are carrying moderate flows across all major corridors with no binding constraints in the current dispatch interval. The most significant flow is on QNI (NSW1-QLD1), running at -550.86 MW — that is, net flow from Queensland into NSW — against an import limit of -984.14 MW, placing utilisation at around 56% of the import capability. Victoria is simultaneously exporting 332 MW north into NSW via VIC-NSW, operating at 37% of its 891.71 MW export limit. The combined effect is NSW drawing supply from both neighbours, consistent with NSW holding the highest mainland spot price at $86.39/MWh against QLD at $80.83/MWh and VIC at $78.57/MWh. The $5–8/MWh price spread across these three regions is modest and reflects the relatively uncongested state of both corridors this morning.
On the southern interconnectors, Heywood (V-SA) is exporting 347.62 MW from Victoria into South Australia, sitting at 50% of its 691.51 MW export limit. SA prices at $83.96/MWh sit above Victoria's $78.57/MWh, and the flow direction is consistent with that differential. Murraylink (V-S-MNSP1) is exporting 19.63 MW into SA — exactly at its export limit of 19.63 MW — making it the only interconnector currently at its operational ceiling, though its small capacity means the market impact is negligible. A Heywood capacity test notice from 2 June remains active, with AEMO having raised the SA-to-VIC test limit from 550 MW to 600 MW under constraint set I-SV_HEY_600_TEST; that testing programme is ongoing and traders should note it may affect available transfer capacity in the SA-to-VIC direction. Basslink (T-V-MNSP1) is at zero flow, with Tasmania priced at $80.18/MWh — closely aligned to VIC and QLD — removing the incentive for material inter-regional transfer at present.
No interconnector constraints are actively binding in dispatch. The most operationally relevant recent notice is the Koorangie–Wemen 220 kV line outage (constraint set V-KOWE, invoked 25 May), which placed limits across VIC1-NSW1, V-SA, Murraylink, and Basslink simultaneously and remains listed as active — engineers should verify current status via the Network Outage Scheduler, as this constraint has the broadest potential footprint of any active notice. The NSW lightning reclassification affecting QNI and N-Q-MNSP1 (constraint set N-ARDM_ARSR_1PH_N-2) was formally cancelled on 2 June following cessation of lightning activity, and that corridor is unconstrained. The Murraylink dynamic rating forecast model, activated 27 May under constraint equations VSML_RAT_LIM_DYN and SVML_RAT_LIM_DYN, is now live in pre-dispatch and PASA — participants modelling V-SA and Murraylink limits in STPASA should confirm they are using the updated dynamic formulation.